How to write the application report of walkie-talkie and flashlight for property security?

relay station

The relay station simply forwards the received signal in a certain frequency band directly through its own transmitter on other frequencies. The two groups of signals with different frequencies do not affect each other, or two groups of users can be allowed to communicate on different frequencies. It has the characteristics of full duplex operation, and the transmitter and receiver work at the same time without interfering with each other.

Second, from the communication mode, simplex communication and duplex communication work in different ways.